ACQUISITIONS AND DISPOSITIONS - Schedule of Estimated Fair Values Assigned to Net Assets and Final Purchase Price Allocation (Details) $ in Millions	Sep. 30, 2024 CAD ($)	Sep. 30, 2024 USD ($)	May 31, 2024 CAD ($)	May 31, 2024 USD ($)	Mar. 06, 2024 CAD ($)	Mar. 06, 2024 USD ($)	Jan. 02, 2024 CAD ($) promissoryNote	Jan. 02, 2024 USD ($)	Nov. 01, 2023 CAD ($)	Sep. 27, 2022 CAD ($)	Sep. 27, 2022 USD ($)	Dec. 31, 2024 CAD ($)	Jan. 02, 2024 USD ($) promissoryNote	Dec. 31, 2023 CAD ($)	Mar. 31, 2023 CAD ($)	Dec. 31, 2022 CAD ($)	Sep. 27, 2022 USD ($)
Fair value of net assets acquired:
Goodwill												$ 36,600,000,000		$ 31,848,000,000		$ 32,440,000,000
Deferred Consideration
Goodwill expected tax deductible period (in years)									15 years
Public Service Company of North Carolina, Incorporated
Fair value of net assets acquired:
Current assets	$ 303,000,000
Property, plant and equipment	4,147,000,000
Long-term assets	189,000,000
Current liabilities	277,000,000
Long-term debt	1,529,000,000
Other long-term liabilities	653,000,000
Deferred income tax liabilities	365,000,000
Goodwill	895,000,000
Purchase price:
Cash	2,710,000,000
Deferred Consideration
Purchase price	2,700,000,000	$ 2,000
Expected credit loss	2,000,000
Regulatory assets	114,000,000
Fair value adjustment of long-term debt	156,000,000
Fair value adjustment of regulatory offset	0				$ 0
Public Service Company of North Carolina, Incorporated | Carrying value
Deferred Consideration
Trade receivables	$ 70,000,000
Questar Gas Company
Fair value of net assets acquired:
Current assets			$ 380,000,000
Property, plant and equipment			6,013,000,000
Long-term assets			163,000,000
Current liabilities			416,000,000
Long-term debt			1,343,000,000
Other long-term liabilities			919,000,000
Deferred income tax liabilities			527,000,000
Goodwill			793,000,000
Purchase price:
Cash			4,144,000,000
Deferred Consideration
Purchase price			4,100,000,000	$ 3,000
Expected credit loss			9,000,000
Fair value adjustment of long-term debt			301,000,000
Fair value adjustment of regulatory offset			0
Questar Gas Company | Carrying value
Deferred Consideration
Trade receivables			$ 202,000,000
The East Ohio Gas Company
Fair value of net assets acquired:
Current assets					493,000,000
Property, plant and equipment					7,276,000,000
Long-term assets					1,689,000,000
Current liabilities					551,000,000
Long-term debt					2,612,000,000
Other long-term liabilities					1,001,000,000
Deferred income tax liabilities					1,045,000,000
Goodwill					1,603,000,000
Purchase price:
Cash					5,852,000,000
Deferred Consideration
Purchase price					5,800,000,000	$ 4,300
Expected credit loss					3,000,000
Overfunded pension plan assets					367,000,000
Regulatory assets					1,200,000,000
Fair value adjustment of long-term debt					478,000,000
The East Ohio Gas Company | Carrying value
Deferred Consideration
Trade receivables					$ 379,000,000
RNG Facilities
Fair value of net assets acquired:
Current assets							$ 31,000,000
Property, plant and equipment							174,000,000
Current liabilities							5,000,000
Goodwill							223,000,000
Purchase price:
Cash							584,000,000	$ 439
Deferred Consideration
Current portion of long-term debt							550,000,000
Long-term debt							207,000,000
Other adjustments							7,000,000
Purchase price							1,348,000,000	$ 1,000
Intangible assets							$ 925,000,000
Amortized on a straight-line basis over an weighted-average useful life (in years)							9 years	9 years
Goodwill expected tax deductible period (in years)							15 years	15 years
Number Of Non-Interest Promissory Notes | promissoryNote							6						6
Remaining consideration payable, payment period							2 years	2 years
Assumed debt							$ 757,000,000	$ 568
RNG Facilities | Non-Interest Bearing Promissory Notes | Notes Payable, Other Payables
Deferred Consideration
Contingent future payment (up to)							$ 808,000,000						$ 606
RNG Facilities | Minimum
Deferred Consideration
Amortized on a straight-line basis over an expected useful life (in years)							13 years	13 years
RNG Facilities | Maximum
Deferred Consideration
Amortized on a straight-line basis over an expected useful life (in years)							42 years	42 years
Aitken Creek Gas Storage Facility
Fair value of net assets acquired:
Current assets									$ 105,000,000
Property, plant and equipment									466,000,000
Current liabilities									20,000,000
Long-term debt									130,000,000
Goodwill									46,000,000
Purchase price:
Cash									397,000,000
Additional consideration									70,000,000						$ 70,000,000
Deferred Consideration
Purchase price									$ 467,000,000
Tri Global Energy, LLC
Fair value of net assets acquired:
Current assets										$ 5,000,000
Property, plant and equipment										3,000,000
Long-term investments										8,000,000
Long-term assets										3,000,000
Current liabilities										61,000,000
Long-term debt										18,000,000
Long-term debt										105,000,000
Goodwill										392,000,000
Purchase price:
Cash										295,000,000	$ 215
Additional consideration										49,000,000							$ 36
Deferred Consideration
Purchase price										344,000,000
Intangible assets										$ 117,000,000
Goodwill expected tax deductible period (in years)										15 years	15 years
Contingent future payment (up to)										$ 72,000,000							$ 53